lib/tdb/test/run-corrupt.c

   1 #include "../common/tdb_private.h"
   2 #include "../common/io.c"
   3 #include "../common/tdb.c"
   4 #include "../common/lock.c"
   5 #include "../common/freelist.c"
   6 #include "../common/traverse.c"
   7 #include "../common/transaction.c"
   8 #include "../common/error.c"
   9 #include "../common/open.c"
  10 #include "../common/check.c"
  11 #include "../common/hash.c"
  12 #include "tap-interface.h"
  13 #include <stdlib.h>
  14 #include <err.h>
  15 #include "logging.h"
  16
  17 static int check(TDB_DATA key, TDB_DATA data, void *private)
  18 {
  19         unsigned int *sizes = private;
  20
  21         if (key.dsize > strlen("hello"))
  22                 return -1;
  23         if (memcmp(key.dptr, "hello", key.dsize) != 0)
  24                 return -1;
  25
  26         if (data.dsize != strlen("world"))
  27                 return -1;
  28         if (memcmp(data.dptr, "world", data.dsize) != 0)
  29                 return -1;
  30
  31         sizes[0] += key.dsize;
  32         sizes[1] += data.dsize;
  33         return 0;
  34 }
  35
  36 static void tdb_flip_bit(struct tdb_context *tdb, unsigned int bit)
  37 {
  38         unsigned int off = bit / CHAR_BIT;
  39         unsigned char mask = (1 << (bit % CHAR_BIT));
  40
  41         if (tdb->map_ptr)
  42                 ((unsigned char *)tdb->map_ptr)[off] ^= mask;
  43         else {
  44                 unsigned char c;
  45                 if (pread(tdb->fd, &c, 1, off) != 1)
  46                         err(1, "pread");
  47                 c ^= mask;
  48                 if (pwrite(tdb->fd, &c, 1, off) != 1)
  49                         err(1, "pwrite");
  50         }
  51 }
  52
  53 static void check_test(struct tdb_context *tdb)
  54 {
  55         TDB_DATA key, data;
  56         unsigned int i, verifiable, corrupt, sizes[2], dsize, ksize;
  57
  58         ok1(tdb_check(tdb, NULL, NULL) == 0);
  59
  60         key.dptr = (void *)"hello";
  61         data.dsize = strlen("world");
  62         data.dptr = (void *)"world";
  63
  64         /* Key and data size respectively. */
  65         dsize = ksize = 0;
  66
  67         /* 5 keys in hash size 2 means we'll have multichains. */
  68         for (key.dsize = 1; key.dsize <= 5; key.dsize++) {
  69                 ksize += key.dsize;
  70                 dsize += data.dsize;
  71                 if (tdb_store(tdb, key, data, TDB_INSERT) != 0)
  72                         abort();
  73         }
  74
  75         /* This is how many bytes we expect to be verifiable. */
  76         /* From the file header. */
  77         verifiable = strlen(TDB_MAGIC_FOOD) + 1
  78                 + 2 * sizeof(uint32_t) + 2 * sizeof(tdb_off_t)
  79                 + 2 * sizeof(uint32_t);
  80         /* From the free list chain and hash chains. */
  81         verifiable += 3 * sizeof(tdb_off_t);
  82         /* From the record headers & tailer */
  83         verifiable += 5 * (sizeof(struct tdb_record) + sizeof(uint32_t));
  84         /* The free block: we ignore datalen, keylen, full_hash. */
  85         verifiable += sizeof(struct tdb_record) - 3*sizeof(uint32_t) +
  86                 sizeof(uint32_t);
  87         /* Our check function verifies the key and data. */
  88         verifiable += ksize + dsize;
  89
  90         /* Flip one bit at a time, make sure it detects verifiable bytes. */
  91         for (i = 0, corrupt = 0; i < tdb->map_size * CHAR_BIT; i++) {
  92                 tdb_flip_bit(tdb, i);
  93                 memset(sizes, 0, sizeof(sizes));
  94                 if (tdb_check(tdb, check, sizes) != 0)
  95                         corrupt++;
  96                 else if (sizes[0] != ksize || sizes[1] != dsize)
  97                         corrupt++;
  98                 tdb_flip_bit(tdb, i);
  99         }
 100         ok(corrupt == verifiable * CHAR_BIT, "corrupt %u should be %u",
 101            corrupt, verifiable * CHAR_BIT);
 102 }
 103
 104 int main(int argc, char *argv[])
 105 {
 106         struct tdb_context *tdb;
 107
 108         plan_tests(4);
 109         /* This should use mmap. */
 110         tdb = tdb_open_ex("run-corrupt.tdb", 2, TDB_CLEAR_IF_FIRST,
 111                           O_CREAT|O_TRUNC|O_RDWR, 0600, &taplogctx, NULL);
 112
 113         if (!tdb)
 114                 abort();
 115         check_test(tdb);
 116         tdb_close(tdb);
 117
 118         /* This should not. */
 119         tdb = tdb_open_ex("run-corrupt.tdb", 2, TDB_CLEAR_IF_FIRST|TDB_NOMMAP,
 120                           O_CREAT|O_TRUNC|O_RDWR, 0600, &taplogctx, NULL);
 121
 122         if (!tdb)
 123                 abort();
 124         check_test(tdb);
 125         tdb_close(tdb);
 126
 127         return exit_status();
 128 }